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Finding the Fourth Proportional to 932.75, 1,287.20 and 518.75

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Solution

The fourth proportional to 932.75, 1,287.20 and 518.75 is: 715.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    932.75 : 1,287.20 = 518.75 : x
  2. Step 2: Convert to fraction form
    932.75/1,287.20 = 518.75/x
  3. Step 3: Cross multiply
    932.75x = 1,287.20 × 518.75
  4. Step 4: Simplify right side
    932.75x = 667,735
  5. Step 5: Solve for x
    x = 667,735/932.75
  6. Step 6: Final answer
    x = 715.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.